Stone-cutting machine



May 29, 1928, 1,671,872

E. R. PLAISTED STONE CUTTING MACHINE Filed Oct. 16, 1926 3 Sheets-Sheetl ld eZ/fifiazszd flaw/66 B yaw/142%.

ATTORNEYS.

May 29, 1928. r

E. R. PLAISTED 'STONE CUTTING MACHINE Filed 001;. 16, 1926 INV'BNTOR l:J1 I lazkd ATTORNEYS.

May 29, 1928.

STONE CUTTING MACHINE Filed-Oct. 16, 1926 3 Sheets-Sheet 3 :1 /9\ v I vo 0 7 I WITNESSES 79 d INVENTOR ha 4 W96 ATTORNEYS.

Patented May 29, 1928.

nmren stars EDGELL ROYCE PLAISTED, OF MONTPELI ER, VERMONT.

STONE-CUTTING MACHINE.

Application filed October 16, 1926. Serial No. 141,991.

The present invention is concerned with a machine for making any desiredangle or cut in a block of stone. In a preferred embodiment of themachine, it includes a swinging carriage-track-carrying member mountedadjacent the work support. A cutter carriage 1s reciprocable along thetrack and the track carrier is preferably mounted for a. swinging oroscillating adjustment about an axis parallel to and spaced from its ownmajor axis and lying without the horizontal and vertical planes of suchmajor axis.

By virtue of this construction, when operating upon a block of stone,the cutter may make a cut in the stone either horizontally,

vertically, or at any intermediate angle, and the girder may be swung toshift the cutter from horizontal to vertical cutting position or viceversa without adjustment of the stone.

More general objects of the invention are to provide a stone cuttingmachine, of simple, practical construction, which will be rugged,durable and eflicient' in use, and which is capable of ready andconvenient adjustment in accordance with the particular planes at whichthe stone is to be cut.

l/Vith the above noted and other objects in view, the invention consistsin certain novel features of construction and combinations andarrangements of parts, as will be more fully hereinafter set forth andpointed out in the claim. The invention may be more fully understoodfrom the following description in connection with the accompanyingdrawings, wherein Fig. 1 is a view partly in end elevation and partly invertical section through the machine.

Fig. 2 is a top plan view of the machine.

Fig. 3 is a view in vertical section on the line 33 of 1.

Fig. 4 is an enlarged vertical section detail on the line 4t4 of Fig. 1.

Fig. 5 is a similar view showing the cutter support rotated through anangle of 90 and indicating in dotted lines an intermediate position ofthe cutter and its associated mechanism.

Fig. 6 is a fragmentary vertical sectional detail on the line 66 of Fig.7.

Fig. 7 is a sectional detail on the line 77 of Fig. 6.

In the drawings 1 have used the reference character 10 to indicate abed, or base, from opposite sides of one end of which, rise a pair ofrelatively heavy columns 11. Extending transversely across the base area pair of tracks 12 embraced by channel irons 13 secured to the underface of a work carriage 14-. (larriage 14 is manually reciprocated alongthe tracks by turning a handwheel 15 connected to a screw 16 working ina threaded sleeve 17 depending from the bottom of the work carriagebetween the tracks.

The upper section l f of the work carriage 14 is preferably rotatableand mounts the work herein illustrated as a' block of stone 18.

Extending tranversely between the columns 11 and pivotally connected toeach column adjacent its upper end is a girder 19 which constitutes thetrack-carrying member above referred to. Mounted for reciprocatingmovement along the girder is a cutter carriage deslgnated generally bythe reference character 20. Means is provided for swingably oroscillatably adjusting the girder for shifting the cutter Wheel 2O fromthe vertical position of Fig. 3 to the horizontal position of Fig. 5, orto any intermediate position such. as indicated in dotted lines in Fig.5. An important feature is an arrangement which permits mounting of thegirder for swinging adjustment about an axis lying without thehorizontal and vertical planes of its major axis and spaced at aconsiderable distance from the intersection of such planes, orin otherwords from said major axis.

One end of the girder 19, to wit: the left hand end thereof in Fig. 1,is bolted to a toothed sector plate 21, said sector plate beingpivotally connected as by a bolt 22 to the upper end of a stationaryplate 23 bolted at 2 1 to the adjacent column 11. The lower end of theplate 23 is curved substantially in conformity with the curve of thetoothed edge of the sector plate 21, and locking means such for instanceas the hooked bolt 25 may be used to clamp the swinging sector plate 21to the stationary plate 23, thereby locking the sector plate and thegirder connected thereto against swing ing movement about the bolt 22.The means for turning the sector plate about its pivot to adjust thegirder has been indicated as a screw 26 operated by a handwheel 27. Thisscrew has bearings at 28 in a bracket or platform 29 secured to the post11 beneath the sector plate 21.

At the oppo ite or r ght head 1 d f the lit) machine in Fig. 1, agenerally similar construction is employed, except that in this instancethe girder is connected to and carried by the plate 32 hung from thepivot bolt 33 and clamping to the sector plate by means of thehook-bolts 25. With particular reference to Fig. 3 of the drawings, itwill be seen that the aligned pivot bolts 22 and 33 permit swingingmovementof the girder about an axis lying without the horizontal andvertical planes of the major longitudinal axis of the girder, suchplanes beingindicated in dot and dash lines in Fig. 3. It is alsoto'benoted that the pivotal axis of the girder is disposed at a point spaceda considerable distance from its major longitudinal axis.

The top ofthe girder 19 is laterally undercut to-form with a track orgib 35 guiding the sliding movement of the cutter carriage, whichilatterincludes a slide member 36 reciprocable along the track in a mannerabout to be described. A screw 37' accommodated in a groove in thegirder 19has a threaded connection with a depending lug 38 on the slide36. At one end the screw is keyed to a gear, 39 disposed between plate32 and sector 30, this gear meshing with a pinion 40 carried byreversing motor 41 supported in any suitable manner upon the girder 19.The reversingmotor. is arranged to operate throughthe gears-i0 and 39andthe screw 37 to reciprocate the cutter carriage back and forth alongthe girder.

Before describing in detail, the cutter earriage and its adjustments, itmay be well to note that the girder 19 preferably includes a pair ofdepending flanges 19 and 19 strengthened at intervals by transverse webs19. The girder is extended at'19 to carr the motor 41. Flanges 19 and 19are pref: erably of greatest width adjacent the center of the girderwhere the twisting strainsare greatest.

The girder must of course be strong enough to overcome these strainswhen the cutter carriage has been tilted to an overhanging position, andmust-be locked against any materialvibration as the cutter carriagereciprocates back and forth over it. It may be noted that theparticularmeans which I have shown for mounting the girder and lookingit against adjustment are subject to awide variety of variations.

A slide member is adjustable transversely of;the slide member 36 of thecutter carriage, this adjustment being preferably effected by a handwheel 51-on ascrew 52. A third slide member 53 is adjustable verticallyvon the slide 50, this adjustment being preferably by a hand wheel 54; ona screw 55. Slide 53 carries an electric motor 56 upon the armatureshaft of-whioh the cutter disc 20 is mounted.

While the. operation of the machine will be generally understood fromthe foregoing description, it may be briefly summarized as follows.WVork carriage 14 is slidably adjustable along its tracks by a handwheel.

15 and the work may be rotated to expose any desired face for engagementby the cutter due to the fact that the upper section of the workcarriage is rotatable relatively to the lower sectionthereof. The girderhas a swinging or oseillatable adjustment about the pivot bolts 32 and33, this adjustment being effected by operating the hand wheel 27 anddrivingthe sector 21 with the screw 26. To lock the girder against suchadjustment, the hooked locking bolt 25 and a simi lar bolt 25 at theother side of the machine are used. The cutter itselfis mounted on thereciprocating carriage and is adjustable in planes parallel to both thehorizontal and vertical planes of the major axis of its supportinggirder.

This arrangement of parts permits a vertical cut to be made in thestone, and then a horizontal cut to be made in the stone, both endsbeing the'same distance from the vertical end face and the horizontalupper face of the stone, and the two cuts following each other withoutany necessity for adjusting the stone after-the original adj ustment hasbeen made.

Such acutting operation on all prior machines would involve either anintermediate stone adjusting operation which takes considerable time, orthe use of some construc tion in which the pivotal axis of: the girderitself was shiftable.

After the work and girder have been adjusted relatively to each other,and the slides of the cutter carriageproperly set, motors -11- and 56are started, the former reciprocating the cutter, carriage back andforth along the girder and the latter: driving the cutter.

The terms horizontal and vertical planes of the major axis of thegirder, have been used rather loosely in the foregoing specification,and the intended meaning of the terms may be explained as fol lows. Bythe vertical plane of the longitudinal axis I mean the plane whichintersects such axis and bisects the upper or track face of the girder.By the horizontal plane of the major longitudinal axis, I mean the planeintersecting such axis at right angles to the above described verticalplane. It will of course be understood that in such positions ofadjustment of the girder, these planes will not be in a strictlyvertical or horizontal position. The terms are here used in order.toavoid undue wordiness in the specification and claim.

For the purpose otthis application I have discussed my invention in itsapplication to the cutting; of stone, although it is-to be understoodthat such, treatment is purely illustrative and in no Way limiting. The

term girder as used both in the specifica Obviously, various changes andalterations might be made in the general form and arrangement of partsdescribed Without departing from the invention. Hence I do not Wish tolimit myself to the details set forth, but shall consider myself atliberty to make such changes and alterations as fairly fall Within thespirit and scope of the appended claim.

I claim:

In a stone cutting machine, a Work support upon which a block of stoneis adapted to be mounted, a girder adjacent the Work support mountedbetween stationary standards for rocking adjustment on a longitudinalaxis lying Without horizontal and vertical planes intersecting its majorlongitudinal above.

EDGELL ROYCE PLAISTED.

